<template>
  <div class="list" ref="wrapper">
     <div>
         <div class="area">
            <div class="title border-topbottom">当前城市</div>
         <div class="button-list">
             <div class="button-wrapper">
                 <div class="button">{{ this.currentCity }}</div>
             </div>
         </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
             <div
                 class="button-wrapper"
                 v-for="item of hot"
                 :key="item.id"
                 @click="handleCityClick(item.name)">
                 <div class="button">{{ item.name }}</div>
             </div>
         </div>
      </div>
      <div
          class="area"
          v-for="(item,key) of cities"
          :key="key"
          :ref="key"
          >
          <div class="title border-topbottom">{{ key }}</div>
          <div class="item-list">
              <div
                 class="item border-bottom"
                 v-for="innerItem of item"
                 :key="innerItem.id"
                 @click="handleCityClick(innerItem.name)">
                  {{ innerItem.name }}
              </div>
          </div>
      </div>
     </div>
  </div>
</template>

<script>
 import Bscroll from 'better-scroll'
 import { mapState, mapMutations } from 'vuex'
 export default {
    name: 'CityList',
    props: {
       hot: Array,
       cities: Object,
       letter: String
    },
    computed: {
       ...mapState({
          currentCity: 'city'
       })
    },
    methods: {
       handleCityClick (city) {
          this.changeCity(city)
          this.$router.push('/')
       },
       ...mapMutations(['changeCity'])
    },
    watch: {
       letter () {
          if(this.letter){
            const element = this.$refs[this.letter][0]
            this.scroll.scrollToElement(element)
          }
       }
    },
    mounted () {
        this.scroll = new Bscroll(this.$refs.wrapper)
    }
 }
</script>

<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
  .border-topbottom
     &:before
        border-color: #ccc
     &:after
        border-color: #ccc
  .border-bottom
     &:before
        border-color: #ccc
  .list
      position: absolute
      overflow: hidden
      top: 1.58rem
      left: 0
      right: 0
      bottom: 0
      .title
         line-height: .54rem
         background: #eee
         padding-left: .2rem
         color: #666
         font-size: .26rem
      .button-list
         overflow: hidden
         padding: .1rem .6rem .1rem .1rem
         .button-wrapper
            float: left
            width: 33.33%
            .button
               margin: .1rem
               padding: .1rem 0
               text-align: center
               border: .02rem solid #ccc
               border-radius: .06rem
     .item-list
        .item
           line-height: .76rem
           padding-left: .2rem


</style>
